153 lines
4.4 KiB
Plaintext
153 lines
4.4 KiB
Plaintext
// Crowd demo: flow-field marching + Boids flocking.
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// 1 = flow, 2 = seek, 3 = boids, left mouse = new target, space = pause.
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// Soft hot-reload guards: keep C++-side crowd state across script reloads.
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persist crowd = null
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persist mode = "flow"
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persist goalX = 0.0
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persist goalY = 0.0
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persist paused = false
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persist mouseWasDown = false
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const AGENT_COUNT = 2000;
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const GRID_W = 80; // 80 * 12 = 960 px
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const GRID_H = 52; // 52 * 12 = 624 px
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const CELL = 12.0;
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function hueToRgb(h) {
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local i = (h * 6.0).tointeger() % 6;
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local f = h * 6.0 - i.tofloat();
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local r = 0.0, g = 0.0, b = 0.0;
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switch (i) {
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case 0: r = 1.0; g = f; break;
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case 1: r = 1.0 - f; g = 1.0; break;
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case 2: g = 1.0; b = f; break;
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case 3: g = 1.0 - f; b = 1.0; break;
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case 4: r = f; b = 1.0; break;
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default: r = 1.0; b = 1.0 - f; break;
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}
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return { r = r, g = g, b = b };
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}
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function retarget(gx, gy) {
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goalX = gx;
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goalY = gy;
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if (mode == "flow") {
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local cx = ((gx - 0.0) / CELL).tointeger();
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local cy = ((gy - 0.0) / CELL).tointeger();
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crowd.buildFlowField(cx, cy);
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}
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}
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function applyMode() {
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local n = crowd.getAgentCount();
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for (local i = 0; i < n; i += 1) {
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crowd.setAgentAction(i, mode);
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if (mode == "seek" || mode == "boids")
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crowd.setAgentTarget(i, goalX, goalY);
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else
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crowd.clearAgentTarget(i);
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}
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}
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eve_init = function() {
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gfx.setBackgroundColor(0.06, 0.07, 0.10, 1.0);
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if (crowd == null)
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crowd = eve.Crowd();
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if (crowd.getAgentCount() == 0) {
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crowd.resizeField(GRID_W, GRID_H, CELL, 0.0, 0.0);
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// 两堵带缺口的墙。
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for (local y = 0; y < GRID_H; y += 1) {
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if (y < 16 || y > 30) crowd.setBlocked(28, y, true);
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if (y < 20 || y > 36) crowd.setBlocked(52, y, true);
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}
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crowd.setDefaultSpeed(95.0);
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crowd.setDefaultRadius(3.5);
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crowd.setDefaultTurnRate(5.5);
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crowd.setSeparationRadius(20.0);
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crowd.setPerceptionRadius(48.0);
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crowd.setSeparationWeight(1.0);
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crowd.setAlignmentWeight(0.04);
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crowd.setCohesionWeight(0.02);
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crowd.setWanderWeight(0.15);
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crowd.setGoalWeight(0.8);
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retarget(GRID_W * CELL - 30.0, GRID_H * CELL * 0.5);
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for (local i = 0; i < AGENT_COUNT; i += 1) {
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local x = 24.0 + (i % 44) * 6.0;
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local y = 40.0 + ((i / 44) % 52) * 6.0;
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crowd.addAgent(x, y, 0.0, 3.5);
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}
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applyMode();
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}
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};
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eve_reload <- function() {
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// 热重载后保持当前行动模式。
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};
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eve_update = function(dt) {
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if (key_just_pressed("1")) {
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mode = "flow";
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retarget(goalX, goalY);
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applyMode();
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} else if (key_just_pressed("2")) {
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mode = "seek";
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applyMode();
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} else if (key_just_pressed("3")) {
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mode = "boids";
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applyMode();
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} else if (key_just_pressed("space")) {
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paused = !paused;
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}
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// 鼠标左键重新指定目标（按下沿）。
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local down = mouse.isDown(1);
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if (down && !mouseWasDown) {
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local mx = mouse.getX().tofloat();
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local my = mouse.getY().tofloat();
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mode = "flow";
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retarget(mx, my);
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}
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mouseWasDown = down;
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if (paused) return;
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crowd.step(dt);
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};
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eve_render = function() {
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gfx.clear();
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// 障碍物（流场阻挡格）。
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for (local y = 0; y < GRID_H; y += 1) {
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for (local x = 0; x < GRID_W; x += 1) {
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if (!crowd.isReachable(x, y)) {
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gfx.drawSolidRect(x * CELL, y * CELL, CELL, CELL, 0.18, 0.20, 0.26, 1.0);
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}
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}
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}
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// 目标点。
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gfx.drawSolidRect(goalX - 6.0, goalY - 6.0, 12.0, 12.0, 0.95, 0.35, 0.25, 1.0);
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// 单位：方块颜色随朝向变化，白色小点为头部。
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local n = crowd.getAgentCount();
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local xs = array(n);
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local ys = array(n);
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local hs = array(n);
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crowd.getPositions(xs, ys);
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crowd.getHeadings(hs);
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for (local i = 0; i < n; i += 1) {
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local h = (hs[i] / 6.2831853 + 0.5) % 1.0;
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local c = hueToRgb(h);
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local r = 3.0;
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gfx.drawSolidRect(xs[i] - r, ys[i] - r, r * 2.0, r * 2.0, c.r, c.g, c.b, 0.85);
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gfx.drawSolidRect(xs[i] + cos(hs[i]) * 5.0 - 1.0,
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ys[i] + sin(hs[i]) * 5.0 - 1.0,
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2.0, 2.0, 1.0, 1.0, 1.0, 0.75);
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}
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};
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